Massacre Wurm enters, it's first ability triggers, giving all opposing creatures -2/-2 until end of turn.
All of your opponents' lands die as a state-based action due to having zero or less toughness, as they are creatures due to
Living Plane.
When the lands die,
Massacre Wurm's second ability triggers for each land that dies this way, causing each opponent to lose 2 life for each land that died under their control.
Results
Destroy all lands opponents control.
Near-infinite lifeloss.
Mass Land Denial.
Metadata
Bracket tag
RuthlessBracket 4+
For competitive decks at brackets 4+
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.